Actually, to scale the note text ($Text) discretely from either the note’s title ($Name) or subtitle ($Subtitle) you should be using the attribute $MapBodyTextSize (as already noted by @bmscmoreira) except it appears to have a bug. In fact there are two (testing in v8.6.2b452):
- Altering $MapBodyTextSize increases/decreases the size of the area within the note in which all/part of $Text is drawn. It should also increate/decrease the size of the text drawn within that space: it used to but currently doesn’t.
- $Interior Scale is intended to scale the size of notes within a container’s viewport of its child map. It should not apply to the $Text area of of a note with no children. It appears $InteriorScale is being applied to a viewport that isn’t there.
I’ve reported the above. So, and confusingly, $InteriorScale currently works around the bug in $MapBodyTextSize, but I’d expect both to be fixed ere long.